For each topic we have a status column, use it for our own to track the status of your progress in the study this topic. In addition, we have a tutorial column where we point to the best video or tutorial for study this topic, this doc is a work in progress, please let us know for any suggestion.

Now by far the best book (although I think I could have created a better version) for studying for programing interviews is: "Cracking The Coding Interview"

Remember that actors interact only using message passing. In order to check actors behavior you can do it through the messages sent to them and back from them. So how do you test actors? You send them messages :)
To test actors that communicate only with messages, you need to send it a message and get reply back and check it.
akka has a TestProbe valp=TestProbe(); // record incoming messages in queue so you can assert and verify them.
Creating actor system for tests: implicitvalsystem=ActorSystem("TestSys") valtoggle= system.actorOf(Props[Toggle]) // this is the actor we are going to test.valp=TestProbe() // this is the test client actor which will record the messages.
p.send(toggle, "How are you") // probe --> tested actor: how are you?
p.exepectMsg("happy") // assert result is happy.
To have the probe actor created for you: newTestKit(ActorSystem("TestSys")) withImplicitSender { // we are in probe actor.valtoggle= system.actorOf(Props[Toggle…

You see it's much easier than you think there exists a limit set of rules you should apply to most of the programming interview questions which involves algorithms and data structures. I have prepared a summary of them for you, just read below and get your tips for today.When you have no clue / Under panic attack => Brute Force!

If you don't have a clue, brute force the fu**** question! In most cases the question you are presented with has a brute force solution. Mention clearly that you are brute forcing it and say that the time complexity is O(n^2) or whatever it is. Then think where do you waste time in your brute force solution, try to improve that part, in many cases, this will get you closer to the actual answer.

By brute forcing you get to be familiarize with the problem better. A common theme for brute forcing means you are going to have a for loop inside a foor loop something like the below, so it's great to get familiarize with common bruteforcing snippets,…

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